Hi Mriganka,
Are you looking for mappping a scenario, where in a customer has multiple permises and would like to have one Consolidated bill for the customer for all the premises?
Assuming the above,.you should look into the Installation group functionality.Installation groups enable you to link master data for billing purposes and then to use the combined billing information to determine the appropriate results.
Go through this link in Servicemarket place for more insights on Installation group.
https://websmp101.sap-ag.de/~sapidb/011000358700008685492004E/Cookbook_Anlagengruppen_en.pdf
Hope it helps...
Thanks,
Amlan